Green Fabrication of Nanoscale Energetic Molecular Perovskite (H_2dabco)Na(ClO_4)_3 with Reduced Mechanical Sensitivity

摘要

High-energy-density molecular perovskite energetic materials with high detonation performance have attracted much attention, but poor safety performance has limited their potential applications. In this paper, nano sodium perchlorate-based molecular perovskite (H_2dabco)Na(ClO_4)3 (nano DAP-1) was fabricated by green ball-milling technology. The structure and morphology of the samples were characterized and the results showed that nano DAP-1 with nearly spherical morphology has a narrow particle size distribution, < 1 μm. The thermal decomposition properties were investigated by differential scanning calorimetry (DSC). The exothermic peak of nano DAP-1 thermal decomposition was 330.0 ℃, a decrease of 51.7 ℃ compared with that of raw DAP (381.7 ℃). The apparent activation energy (Ea) of nano DAP-1 was calculated to be 160.9 kJ·mol(-1), which is lowerthan that of raw DAP-1 (168.6 kJ·mol~(-1)). Mechanical sensitivity studies showed that nano DAP-1 (H_(50): 64 cm) exhibited a lower impact sensitivity than that of the raw DAP-1 (H_(50): 51 cm). This work provides a simple and effective way for improving the thermal decomposition properties and safety performance of molecular perovskite energetic materials.